Quick answer
If you under-report your income on a marketplace application and get a bigger premium tax credit than you qualify for, you’ll pay back the extra when you file your taxes. Starting with 2026 coverage, there’s no cap on that repayment, so a low estimate can mean a large tax bill. Honest mistakes are settled at tax time; knowingly giving false information can bring civil penalties of up to $250,000.
Key takeaways
- Your tax credit is based on your estimate of this year’s household income.
- At tax time, Form 8962 compares the credit you got with the credit you qualify for.
- From 2026 on, you repay the full difference, with no cap.
- If your income ends up above 400% of the poverty level, you repay all of the advance credit.
- Report income changes to the marketplace within 30 days to avoid a surprise.
On this page
How the tax credit uses your income
When you apply through HealthCare.gov or your state’s marketplace, you estimate your household income for the year. The marketplace uses that estimate to figure your advance premium tax credit, which is paid straight to your insurer to lower your monthly premium. If your income is under 250% of the poverty level, it also decides whether you get cost-sharing reductions, which lower your deductible, copays and coinsurance. If your income is low enough, you may be sent to Medicaid instead; see health insurance for low-income families.
What happens at tax time
Your Form 1095-A shows the advance credit you received. On Form 8962, you figure the credit you actually qualify for based on your real income. Here’s an example for one person with the average benchmark premium in 2026:
| Actual income | Credit you qualify for | Amount you repay |
|---|---|---|
| $30,000 (what you estimated) | $5,640 | $0 |
| $35,000 | About $4,885 | About $755 |
| $45,000 | About $3,188 | About $2,452 |
| $65,000 | $0 | $5,640, the full credit |
Before 2026, repayment was capped for most people with incomes under 400% of the poverty level. That cap is gone. See do you have to pay back your premium tax credit.
Mistakes vs. fraud
Income is hard to predict, especially if you’re self-employed or change jobs, and the marketplace expects some estimates to be off. That’s what reconciliation is for. Knowingly lying is different: federal law allows civil penalties of up to $25,000 for giving incorrect information through negligence and up to $250,000 for knowingly and willfully giving false information. The marketplace also checks your estimate against IRS and other data and may ask for proof.
How to avoid a big bill
- Estimate carefully. Include wages, self-employment income, unemployment, Social Security and other taxable income for everyone in your tax household.
- Report changes within 30 days. Update your application when your income or household changes.
- Take less credit upfront. You can choose to apply only part of your credit to your premium and get the rest as a refund if you qualify.
- Plan for a job change. If you expect a raise or a new job, update your estimate or set money aside.
If your coverage is job-based or you’re 65
If you’re offered affordable job-based coverage, you can’t get a marketplace credit at all; see is it cheaper to get health insurance through your employer. Once you’re eligible for premium-free Medicare Part A, tax credits stop; see who is eligible for Medicare.
For more on shopping and enrolling, see how to buy health insurance outside the ACA exchanges (where no credit is available), health insurance coverage types, health insurance for individuals and how long it takes to get health insurance after applying. Paying your own way without a credit is also an option; see what if you can afford your medical bills out of pocket.
See what you’d pay after a tax credit: compare plans by ZIP code.
Frequently asked questions
Will I get in trouble if my income was higher than I estimated?
Not if it was an honest mistake. You’ll repay the extra credit when you file your taxes.
What if my income ends up lower than I estimated?
You may get a larger refund. If your income falls below the poverty level, you usually won’t have to repay the credit you received based on a good-faith estimate.
How does the marketplace check my income?
It compares your estimate with IRS data and other sources. If they don’t match, you’ll be asked to send documents, like pay stubs, or your credit may change.
Sources
This article is general information, not tax or legal advice. Talk with a tax professional about your situation. Last reviewed September 2026.